That list is an incomplete list of currently-supported games. I can't say for certain, but I strongly suspect that all Source games will end-up on Linux. (It would be less work to port the rest of them than to port games with a completely different engine, I imagine.)

Can't wait for CS:GO to get ported. Love that game, but hate rebooting into Windows to play it. FT2 it is, for now.

There's the complete list of Steam games that are for sure coming to linux sooner or laterhttp://marlamin.com/cdr/search.php?s=linux&searchby=osThis is straight from the Steam database, so the linux versions of these games already have been confirmed and added to the Steam linux games list, although many of them are not finished yet and you have to wait for them to be done.